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在桥梁抗震设计中,剪力键既要限制上部结构横向位移过大以防止发生落梁,又要避免传递过大的横向地震力造成桩基础的损伤,因此通常被设计成牺牲型单元。该文基于一种新型可复位桥梁外剪力键,并结合我国桥梁工程实际,对约束良好的4个新型可复位桥梁外剪力键试件进行单向水平荷载试验,阐明了该新型可复位外剪力键的破坏形态、失效模式和受力机制,分析竖向配筋率对该类新型外剪力键力学特性的影响,建立新型剪力键的承载能力计算公式,且计算结果与试验数据吻合较好。研究结果表明:该类新型剪力键能够有效地减小桥墩盖梁或桥台台帽损伤,且具有位移能力强、易修易换等优点,尤其适用于基于性能的桥梁抗震设计。
In the seismic design of bridges, the shear key is usually designed as a sacrificial unit, which limits the lateral displacement of the superstructure to prevent the falling of the beam and avoids the transmission of excessive lateral seismic force to damage the pile foundation. In this paper, based on a new type of re-delineable external bridge shear bond, combined with the actual bridge engineering in our country, four well-constrained new-type re-delineable external bridge shear test specimens were subjected to one-way horizontal load test to clarify the new resettable The influence of vertical reinforcement ratio on the mechanical characteristics of this kind of new type of external shear bond, the formula of bearing capacity of the new type of shear bond is established, and the calculation results and tests The data fit well. The results show that the new type of shear key can effectively reduce the damage of the bridge cap girder or abutment cap, and has the advantages of strong displacement ability, easy repair and easy exchange, and is especially suitable for the performance-based seismic design of bridges.